Blade for window blind



FIG. 1 is a perspective view showing the blade for window blind of my new design in an installed position, shown broken away to indicate indeterminate length with the adjacent blade shown in broken lines for illustrative purposes only and forming no part of the claimed design; and

FIG. 2 is rear view thereof;

FIG. 3 is an end view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a front view thereof. 

I claim the ornamental design for a blade for window blind, as shown and described. 